Comments: Revised by Merriam (1895a). Species boundaries in this genus, as in other pocket gophers, are difficult to define. Complex relationships have been described for several diagnosable geographic units based on a variety of contact zone analyses that have employed morphological, karyological, allozyme, and/or mitochondrial and nuclear DNA biochemical analyses. These have indicated varying degrees of hybridization between geographically differentiated forms, and authors have varied in their reco...

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